[Plan-14] Increment 6: Documentation

[basmeerman]

Context

Plan 14: CircuitMeter — Increment 6 of 6

Scope

Document CircuitMeter in all relevant docs.

Acceptance Criteria

• features.md: CircuitMeter section with wiring diagram
• configuration.md: CircuitMeter, CircuitMeterAddr, MaxCircuitMains settings
• mqtt-home-assistant.md: CircuitMeter MQTT topics
• ere-session-logging.md: Circuit energy in session records
• power-input-methods.md: CircuitMeter in comparison table

Dependencies

Increment 5

Files

• Modify: docs/features.md, docs/configuration.md, docs/mqtt-home-assistant.md, docs/ere-session-logging.md, docs/power-input-methods.md

[basmeerman]

Implemented in PR #117 (merged to master).